Tetra Tech, Inc. and CGRS, Inc. are partnering with the City of Boulder, Colo., on their Biogas Use Enhancement Project, a biogas-to-renewable natural gas (RNG) conditioning system under construction at the city’s Water Resource Recovery Facility (WRRF). Biogas produced from wastewater digesters will be converted into RNG for vehicle fuel for delivery to community partners after injection into the Public Service Company of Colorado delivery systems. The delivery of RNG to the City of Boulder is scheduled for September 2020.

This project will enable the city to qualify for grants available to renewable fuel producers under the U.S. Environmental Protection Agency’s Renewable Fuel Standard.

“We’re pleased to realize the positive impact on the community’s climate goals through production and use of RNG as vehicle fuel, as well as the City’s financial ability to support other renewable energy and sustainability projects in the future through sale of RNG," said Chris Douville, Wastewater Treatment Manager for the City of Boulder.

The work includes installing Tetra Tech’s proprietary BioCNG gas conditioning system, replacing the existing cogeneration engines and heat recovery systems, and upgrading the hydronic system used to heat the digesters and other buildings.